lewis et ai



March 29, 1927.`

N. E. LEWIS ET A1.

FURNACE Filed Sept. 29. i921 2 Sheetsshet l 7 ATTORNEYS Patented Mar. 29, 1927.

UNITED STATES yPATENT OFFICE.

NATHAN E. LEWIS, OF PLAINFIELD, NEW JERSEY, AND DOUGLAS WARD WILLIAMS, OF NEW BRIGHTON, STATEN ISLAND, NEVI YORK, ASSIGNORS T THE BABCOCK & WILCOX COMPANY, OF BAYONNE, NE JERSEY, A CORPORATION OF NEW JERSEY.

FURNACE.

Application filed September 29, 1921.

Our invention particularly relates to a novel form of gas-burning furnace and to the novel form of gas-burning furnace in combination with an oil-burning furnace.

Our invention will best be understood by reference to the accompanying drawings, in which Figurel is a longitudinal section through a boiler setting and the associated furnace and the steam boiler which is heated by the furnace; Fig. 2 is a horizontal sec'- tion, the parts of which from left to right are taken on the planes of the lines A-A, B-B and C-C of Fig. 1, and Fig. 3 is a view, partially in transverse section and partially in front elevation, of the arrangement shown in Figs. 1 and 2.

Like reference characters indicate like parts throughout the drawings.

Referring, now, to the drawings, 10 is the front wall, l1 the rear wall, and 12 and 13 the side walls of the setting. A combustion chamber 14 is enclosed between the front wall 10 and a bridge wall 15. The steam boiler, in connection with which we have illustrated our invention, is of the Stirling type and comprises a mud drum 17, preferably located at the rear of the bridge-wall 15, to which are connected a plurality of banks of tubes 18, 19 and 20. The front wall of the setting is preferably supported by a plurality of I-beams 21, as indicated in Fig. 1,`an opening being provided between the I-beams and the base 22.

Oil is supplied to the furnace through a preferably passing from the front to the rear of the furnace beneath the floor. In the form of burner illustrated, steam is supplied to the oil atoniizer by a pipe in a known manner. The rear ends of the oil and steam pipes 23 and 25 are provided with upwardly-directed extensions 26 and 27 which lead to an atomizing nozzle 28, of known form. The eXtension 26 and 27 and the nozzle 28 are preferably located in an elongated transverse chamber 29 in the bridge-wall 15, as indicated in Fig. 2, so that the extensions 26 and 27 can be moved horizontally beneath the floor into position in the chamber 29 and then turned upwardl to proper position. The

bridge-wall 15 is also preferbaly provided,

with a forwardly bevelled opening 30 in front of the oil burner, through which a fanshaped oil spray may be directed into the pipe 23 cont-rolled by a valve 24, the pipe` Serial No. 504,230.

furnace. A hood 31 of refractory material is preferably located above the chamber 29. We have illustrated three separate oil burners of the same or similar construction, and a separate flue or passage 32 is preferably provided for each of the oil burners, the lues being separated by walls 33 extending from the base to the floor of the furnace. The oil burner and its associated parts illustrated, is similar to that shown in a patent to Irish No. 1,364,502, which was issued on or about January 4, 1921.

Gas is supplied to the furnace by .a main 34, to which are connect-ed branch pipes 85 and 36 provided with valves 87 and 38 for controlling the gas supply from the respective branches. The gas burner, which we have indicated generally at 39, is divided into front and rear sections 39a and 39", which are lsupplied with fuel from the respective pip-es and 36, the sections 39 preferably being located at a lower level than the section 39a. Dividing the gas burner in the bottom of the furnace into a plurality of sections which are located at different levels, and bringing the air supply for the respective sections through passages located beneath the section at the higher level, is an advantage as it mak-es possible the use of passages of ample proportions to carry the air supply yto the respective sections which would not otherwise be possible and, at the same time, makes possible the use of a lower setting than would otherwise be the case, it being understood that th-e height of the setting is determined by the distance between the gas burner and the boiler tubes. The gas burner illustrated is also divided into a plurality of sections arranged transversely of the furnace, the respective transverse secltions being located above the passages 32,

each transverse section preferably beingsupplied with gas from three pairs of pipes 35. 36,- as best indicated in Fig. 2. To each of the pipes 35, which extend only beneath the front section 39a of the burner, are connected short laterally extending pipes 40, preferably extending from opposite sides of each pipe, as indicated in Fig. 2, each of the pipes being` provided on the upper side with an opening 41. A hollow cylindrical tile 42 is seated on the end of each of the pipes 40 and communicates therewith through the opening 41 constitutes an individual gaa burner, the tiles passing through the `licor of the fin'nace, which floor will be directly described. In a similar manner, the pipe 36 isv provided, beneath the rear section 39h of the burner, with laterally extending pipes 40, on which tiles 42 are similarly seated.

The floor of the furnace is preferably supported on rods or pipes 43, which are, in turn, supported on the walls 33, as best shown in Fig. 3. Un the pipes are .laid refractory bricks or tiles 44 between the hollow tiles 42 and' extending transversely ofthe furnace. These bricks are preferably laid flush with the upper ends of the tiles Other bricks 45 are also laid between the tiles 42 and at right-angles to the bricks 44, the bricks 45 preferably being laid up above the upperl ends of the tiles 4Q, as indicated in Fig. 3. The spaces 43 between the hollow tiles-42 and the bricks 44 and 45 are preferably packed with seine refractory material, suchas fire-clay andv powdered asbestos, as at 47, to prevent air leaking through the floor and to protect the supporting ironworlr underneath. F lat tiles or bricks 48 are preferably laid above the tiles 42 across the upper layers ofA bricks 45, which forni a checkerworlr therewith and constitute targets against which the gas Haines from the burners i-inpinge. It will thus bev seen thaty the tiles 42 Aproject through the ioor of the furnace, the fiaine frein the tiles passing upwardly between the bricks 45 and thence between the overlying bricks 48. A separate wind-boze 49 is provided for each of the trafnsversesections beneath the front section 39 ofthe gas burner, three such front windboXes, in the forni illustrated', thus being provided. The tiles 42 of the front section 392L project into the wind-boxes 49, as indicatedl in Fig. l. Each wind-box 49 leads to the front of the furnace and the supply of air thereto is cont-rolled by a door l, hingedV as at- 52, to swing upwardly. Similarly, a

wind-box 53 is providedfor each of the rear sections 39b of the gas burner, .each of which is provided withl a passage 54 leading to the forward end of the furnace, the air to each' ofK these Wind-boxes bein@l controlled by a door 55, hinged as at 5b, to swing downwardly.

The front wall is preferably provided with a plurality of access and ignition openings 57, one for each of the transverse sections of the gas burner, cach opening being provided at the front with a door 58 and preferably being partially walled up at thc rear, as at 59. By removing the wall 59, more coinplete access may be had to the interior of the furnace. rIfhe front wall is also provided with peep-holes 6() closed by suitable doors 6l, and" the side walls are also preferably provided With peep-holes, as indicated a-t 62.y

In accordance with our invention, the

front and rear sections of the gas burner, for whichthe gas and air supplies are separately controlled, inay be separately operated. This is. desirable under seine circumstances where it .is` necessary to operate only one of the burners, particularly the rear burner. Furthern'iore,V dividing the gas burn-er .int-o sections and separatelyl controlling the sanie, makes possible the operation, when desired, of one of the sections of the gas burner iu conjunction with the oil burner. Txhen i-t'is uesired to operate theoil burner, the operation of the gas biu'ners is discontinuedy and the gas supply according ly cut ofi. In accordance with our invention, however, the air supply for the rear section of the gas burner is utilized'. in the operation of the oil burner. rhe door or doors are then opened, thereby. admit-ting air to the wind-boxes 53, the air passing through the tiles 42`of the rear section 39vb of thel gas burner beneath the oil spray, which is projected forward-ly into the furnace by the oil' atoniizer.

In case it is desired to. admit air at the rear of the fur-nace only to the fan-shaped oil sprays, those gas burners at the rear corners of each ofthe transverseV sections of the gas burners located outside of'the lines @-5, and indicated at 42a may be emitted.'

Vhat we claim andy desi-re to secure by Letters Patent ofi the UnitedStates isz l. Ina furnace, a gas burner located inthe bottoni thereof and comprising aplurality of sections located aty dilferent levels, and independent air ducts located beneath the section at tue higher level forV conveying air to the respective sections.

2. In a furnace, a gas burner located in the bottoni thereof and comprising a plurality of sections located at different levels from the front to the rear 'of the furnace, and independent air ducts located beneath the front section for conveying air to the respective sections.

3. In a furnace, a gas burner located in the bottoni thereof and comprising a plurality of sections from the front to the rear ofv the furnace, the front section being located at a higher level than the rear section and independent air ducts locatedl beneath the front section for conveying air froin the front of thc furnace to the respective sections.

4. In a combined oil and gas burning furnace, au oil burner located at the rear ofthe furnace and constructedand ar ,anged to project oi-l in the forrnof a spray into the furnace, a gas burner located in the bottone of the furnace and divided into a plurality of sections froin the front to the rear ofthe furnace, independent air ducts located beneath said gas burner, each duct beine arranged to supply air to one section ofthe gas burner only, and independent means to control the air supply to each of said ducts, the air duct leading to the section adjacent the oil burner being arranged to supply air to the oil burner.

5. In a combined oil and gas burning Jfurnace, an oil burner located at the rear of the furnace and constructed and arranged to project oil in the form ot a spray into the furnace, a gas burner located in the bottoni of the furnace and divided into a plurality of sections from the front to the rear of the furnace, with the sections from the front to the rear at progressively lower levels, independent air ducts located beneath said gas burner, each duct being` arranged to supply air to one section of the gas burner only, independent means to control the air supply to each of said ducts7 and the air duct leading to the section adjacent the oil burner being arranged to supply air to the oil burner.

6. ln a combined oil and gas burning furnace, an oil burner located at the rear of tlie furnace and constructed and arranged to project oil in the form of a spray into the furnace, a gas burner having a plurality of gas burner tubes located in the bottom of the furnace, means to supply combustion air to said gas burner and to said oil burner, and means to Shut ofil the supply of air to a part only of the gas burner tubes While air is being supplied to said oil burner.

7. A combined oil and gasburning furnace comprising a floor, means for projecting an oil spray into the furnace comprising a pipe extending beneath the furnace lloor from the front to the rear of the furnace, and a gas burner divided into a plurality of Sections from the front to the rear of the furnace and comprising hollow tiles projectingthrough the Hoor, independent means for supplying air to the respective sectons of said gas burner, and independent means for controlling the gas and air supplies to the rear section of said gas burner whereby the air supply to the rear gas burner section may be utilized in the operalion of the oil burner.

NATHAN E. LEWIS. DUUGLAS WARD WILLIAMS. 

